Hello, I have a 94 v6 that's hard to start. New fuel lines from motor to tank,new fuel filter,39 psi at fuel rail.and has spark..in the old days that's all that was needed. Now with all these sensors.crank ,cam etc. it's not that simple . Car only has 90k on it but has been abused. And left to die. So I picked it up for my 16 yo. Fuel pressure dropped 5 psi in 1/2 hour.and will be 0 psi in the morning. Not sure of head gasket or intake manifold gaskets being good. Thanks.